Reducing-valve.



uur ourson REDUCING-VALVE.

incasso.

Specification of Letters, Patent.

Patented Sept. 1, 1914.

Application led August 23, 1912. Serial No.- 716,777.

To all whomz't may concern Be it known that l, GEORGE H. View, of thecity of Montreal, in the Province of Quebec andDominion of Canada, haveinvented new and useful Improvements in B educing-Valves, of which'thefollowing'is a full, clear, and eXact- 'description t This inventionrelates to improvements in reducing valves, and the object is to providea valve-of strong and simple construction which maybe very accuratelyadjusted to reduce a uctuating fluid pressure to a lower and uniformfluid pressure.

A further object is to provide areducing valve particularly designed tobe used in connection with heating and drying systems, in which it isessential to maintain the steam at a low and unvarying pressure for longperiods of time, regardless'ot variations in the pressure of the steamsupplies.

1n the drawings which illustrate the invention Figure l is a verticallongitudinal section of the reducing valve. Fig. 2 `is a horizontalsection on the line 2-2, Fig. 1.

Referring more particularly to the drawings, 3 designates a casingprovided at op@ posite ends with-flanges 4 or other suitable means forattaching the valve in av pipe line. The inlet and outlet passages 5 and6 respectively of the body are-separated by a diaphragm 7, asis usual inthe structure of globe valves. The top of the valve'is providedwith-alarge circularopening 8 which communicates with the qutlet passa e6. Thel bore of this opening; is carried own through the outlet passage6 and nearly through the diaphragm 7. A. slightly smaller aperture 9 isormed through the diaphragm so that a shoulder 10 `is formed uponwhichis seated a bushing 11 which may be driven or screwed into the opening8. The lower end of this bushing is provided with an internal ange 12.As will be seen inthe drawings, the outlet passage 6 and vbushing 11 areso arranged that the passage extends entirely around the bushing.Communieation between the interior of the bushing and the outlet passageis -established through a plurality of apertures' or ports 13 formedthrough the wall of the bushing. A piston 14 is slidably mounted in thebushing and is of suiiicient depth to Coverall the ports 18. The lowerside of the piston is concave and is provided at the center with adownwardly extending hollow projection 15.

Below the piston is a disk 16 hav-ing a circumferentially grooved post17, which enters the projection 15 and is held against re- .ciprocator-ymovement relative thereto, but

is permitted rotary movement by means of a pin 18 fixed in theprojection 15 and engaging the groove 19. This disk 16 rests on theflange 12 and limits the downward movef ment of the piston 14. Aplurality of -apertures 20 are formed through the disk and communicatethrough the aperture 9 with the inlet passage 5. rlf'he valve stem 21 isprovided at vits lower end with a collar 22. A split nut 23 is screwedinto the upper sur- -face of the piston and bears against'the uppersurface of the collar 22, so that the valve stem is attached to thepiston and is at the same time allowed to revolve relatively thereto.The central portion of the valve stem is provided with screw threads 24which engage with corresponding threads25 formed in a neck 2.6, whichisrigidly secured to the upper part'of the body 3. The valve stem passesout of the neck through a stuiiing box 27, and may beprovided with anysuitable rotating means such as a hand wheel or crank, indicated 4at 28.

The operation ofthe valve will be .well understood from the drawin andneed'only vbe brieliy described. T e steam enters through the passage 5and passesinto the .bushing 11 through the apertures 20 of the disk 16.When the valve stem is rotated suiiiciently to uncover a suitable areaof the ports 13, the steam rushes through these ports into the outletpassage 6. It will be readily understood that it will be possible toprovide a greater outlet area in the apertures 13 than in the apertures20, so that steam at highy pressure passes through the apertures 20 andexpands within the bushing 11 under the piston, and then passes throughthe ports 13 at reduced pressure and velocity and eX- pands into thelarge outlet passage 6. The concave lower face of the piston 14 has atendency to throw the steam back upon itself,

so'that the velocity of the flow is checked. By raising the piston onlya small amount, a very small port opening can beobtained, so that steamentering the valve at very high pressures will leave at very lowpressures.

Having thus described my inventiomwhat I claim is z l. A reducing valvecomprising a body having inlet and outlet passages, a cylinder in saidbody communicating through its end with the inlet passage, ports in thecurved Wall of said cylinder communicating with the outlet passage, apiston valve in said cylinder an apertured disk carried by said pistonvalve and spaced` therefrom, and means for reciprocating the valve tocover and uncover the ports.

2. A reducing valve comprising a body having inlet and outlet passages,a cylinder in said body communicating through its bottom With the inletpassage,A ports in the curved Wall ofsaid cylinder communicatin with theoutlet passage, a piston in sai cylinder havinga concave lower face, an

apertured disk carried by the piston limiting fluid flow through thebottom of the cylinder, and means for' reciprocating the piston to coverand uncover the ports.

3. A reducing Valvey comprising a bodyv having inlet and outletpassages, a cylinder in the body having apertures communicating with theoutlet and with the inlet, a piston valve mounted to reciprocate in saidcylinder having a downwardly extending projection and an apertured diskprovided with a post revolubly mounted in said projection.

In Witness Whereoi` I have hereunto set my hand in the presence of twoWitnesses.

GEORGE H. VIGER.

Witnesses:

STUARD R. W. ALLEN, G. M. MORELAND.

